One of the major sins is not to protect oneself (one's clothes and body) from one's urine (i.e., from being soiled with it)

Sahih al-Bukhari · Book 4 · Hadith 216

حَدَّثَنَا عُثْمَانُ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ مَرَّ النَّبِيُّ صلى الله عليه وسلم بِحَائِطٍ مِنْ حِيطَانِ الْمَدِينَةِ أَوْ مَكَّةَ، فَسَمِعَ صَوْتَ إِنْسَانَيْنِ يُعَذَّبَانِ فِي قُبُورِهِمَا، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ يُعَذَّبَانِ، وَمَا يُعَذَّبَانِ فِي كَبِيرٍ ‏"‏، ثُمَّ قَالَ ‏…

Narrated Ibn `Abbas: Once the Prophet, while passing through one of the graveyards of Medina or Mecca heard the voices of two persons who were being tortured in their graves. The Prophet (ﷺ) said, "These two persons are…